Boiler furnace



May 28, 1929. l G,'P. JACKSON 1,714,673

' BOILER FUBNACE l Filed sept. 10, 1925 2 sheets-sheet 1 2 Sheets-Sheet G. P. JAcKsoN Filed sept .v lv. 1925 Mayl 28, 1929.

plied.

Patented May'28, 192.9.

UNITED-STATES GEORGE P. JACKSON, on FL'UsHING, NEW YORK, ASSIGNOR rro INTERNATIONAL coM- 1,714,673 PAT-ENTOFFICE.

BUSTION ENGINEERING CORPORATION, CORPORATION OF DELAWARE.

BOILER FURNAOE.

. Application illed September This invention relates toboiler furnaces. and has to doparticularly with furnaces, the combustion space of which is largely defined by evaporating elements of a boiler.'

The invention is especially useful in pul' vcrized coal burning stationary boiler installations and will be .described as thus ap-A One Of the primary objects of the invention isA to simplify thelconnections in such an installation, to provide for effective circulation and the preventionv of siphoning and-to provide forKexpansion and contraction.

`How the foregoing objects, together with such others as many hereinafter appear, or are incident to my invention, are realized, is illustrated in preferred formin the accoms panying drawings, wherein y p Fig. 1 is a vertical section thru a boiler and a boiler furnace embodying my inprovements, and l y Fig. 2 is an enlarged'fragmentary view, partly in section, illustrating details ofthe in-L l vention and Fig. 3 is a fragmentarycross sectional view illustrating such details.

Referring now to Figl, the reference character A denotesa combustion chamber havmg i the outlet 7 in'its upper part over which extend boiler tubes 8 as indicated in dotted lines'. A large portion of each side wall of the combusion chamber is provided with a water wall B composed of tubes 9, preferably-provided with longitudinally extending lins 10 as y illustrated in Fig. 3. The rear wall of the furnace is largely composed of a water wall G formed of tubes 11havin T linslO as above described. The upper enclos of the tubes, 9 of the side -water walls B are bent outwardly to extend thru the side walls lfor connection into theheadersV 12 and the lower ends ofA such tubes pass outwardlyL thru the side walls for connection into the headers 13. The upper ends of the tubes '11 extend thru the rear wall for connection into the'h'eader 14, and the lower ends of such tubes pass tothe exterior for connection intov the unction boxes 15 to be described.

A screen D is'located in the lowerpart of the combustion space, such screen being composed .of `tubes 16 relatively widely spaced apart to permit the gravitating refuseto pass freely thcrethru to the hopper 17 therebelow. The front ends of these tubes are connected 1o, i925. serial No. 55,48.

-to the header 18 and the branch 22 leading to the headers 13. These branches are of sinuous f orm to .take Careof expansion and contraction. From each header- 12 an upcomer ity of small pipes25 lead to the drum 20 to complete the circuit.

From one end of the header 14 an upcomer pipe 26 leads toa box 27 which connects with certain of the pipes 25, and from the other end of the header 14 a similar upcomer pipe 28 leads to' a similar box similarly connected.

Since the screen D `has about one half the number of tubes of-whichthe rear water wall C is formed, the junction-,boxes 15 are approximately Y shaped having three Openings, one below and two above to respectivel receive one .of the pipes 16 and two o the pipes 11. y

VPulverized coal is' admitted into the upper part of the combustion chamber in a down- `pipe 23 leads to a box 24 from which a pluralin U shape with combustion practically completed before the tubes 8 are reached'. The tubes 9, '11' and 16 being subjected to radiant heat perform by far the largest proportion v'of the evaporation done by the boiler and the circulation therethru is very rapid indeed, to which end I'liave found it useful to cause the upcomer pipes to discharge into the plurality of small branches leading to di'ierent parts of the drum to avoid siphoning and yet to per- -mit a free flow of steam.

The various bends in the tubes take care of expansion and contraction andthe junction' boxes form an effective means for coupling' the tubes of the bottom sc`reen D to the tubes of the rear water wall. j

What'I claim is In combination ina pulverized fuel burning furnace, a water'screen in the lower part thereof composed of relatively widely spaced tubes which project through a wallof the furnace, a water wallV composed of relatively closely spaced exposed tubes alon an upright Wall of the furnace, the ends o 'lsaid latter tubes being bent and extending atan angle i lin the 'Water Wall as inthe Water screen, a'

junction box, V-shaped in side 'elevation and inverted triangular shaped in front elevation,

said junction boX having two tube holesilrthe upper part thereof in anglesof the triangle` lower angle -of said triangle into which a single tube of the said Water screen is connected, said tube holes facingin the same general direction, and means connecting the screen and water Wall into the circulation -of the boiler'.

` In testimony -Wllereof I have Signed my name; GEORGE P. JACKSON.

hereunto intovvhich pairs of the said Water Wall-tubes j are connected and a` single tube hole* in the 

